X-ray Spectral Investigation of SiO2/TiO2/C Nanocomposites

Authors B. Ilkiv1, S. Petrovska1, Ya. Zaulychnyy2

1Frantsevich Institute for Problems of Materials Science of National Academy of Sciences of Ukraine, 3, Krzhyzhanovsky St., 03142 Kyiv, Ukraine

2National Technical University of Ukraine “Kyiv Polytechnic Institute”, Engineering-physical Faculty, 35, Polytekchnichna St., 03056 Kyiv, Ukraine

Е-mail sw.piotrowska@gmail.com
Issue Volume 11, Year 2019, Number 4
Dates Received 11 March 2019; revised manuscript received 01 August 2019; published online 22 August 2019
Citation B. Ilkiv, S. Petrovska, Ya. Zaulychnyy, J. Nano- Electron. Phys. 11 No 4, 04001 (2019)
DOI https://doi.org/10.21272/jnep.11(4).04001
PACS Number(s) 73.22. – f, 61.43.Gt, 71.20.Ps, 71.23. – k, 73.20.At, 78.70.En
Keywords Carbon (56) , Silica (5) , Electronic structure (3) , Ultrasoft X-ray emission spectroscopy.

The electronic structure of SiO2/TiO2/C nanocomposites was investigated using the ultrasoft X-ray emission spectroscopy (USXES) method. The energy redistribution of valence electrons affected by composition of SiO2/TiO2/C hybrid materials was studied. The USXES SiL(-, CK(- and ОK(-spectra for the SiO2/TiO2 and SiO2/TiO2/C compounds were derived. It was revealed that almost all two-phase oxides penetrate to carbon pores in the ST65+C (50 wt. % C, 17.5 wt. % SiO2, 32.5 wt. % TiO2) nanocomposite after high-frequency vibration synthesis. It was shown that penetration of TiO2 to highly porous carbon is higher than SiO2. It was found that oxygen related to TiO2 does not form bonds with carbon atoms. It was revealed that the contribution of s-states in ST20+C (50 wt. % C, 40 wt. % SiO2, 10 wt. % TiO2) nanocomposite increased as compared to ST20 (80 wt. % SiO2, 20 wt. % TiO2) owing to carbon Cs-states addition. It was shown that SiC is formed in ST65+C nanocomposite owing to substitution of oxygen atoms by carbon atoms in the presence of TiO2 as a catalyst. Investigation of the electronic structure of SiO2/TiO2/C nanocomposites allows solving an important task of predicting their physical and chemical properties and synthesising materials with necessary properties.

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